Fixes: more jquery 1.6.x attr->prop problems

data/js/rootDirs.js

@@ -126,7 +126,7 @@ $(document).ready(function(){
 
         // if nothing's selected then select the default
         if (!$("#rootDirs option:selected").length && $('#whichDefaultRootDir').val().length)
-            $('#'+$('#whichDefaultRootDir').val()).attr('selected', 'selected')
+            $('#'+$('#whichDefaultRootDir').val()).prop("selected", true)
 
         // if something's selected then we have some behavior to figure out
         if ($("#rootDirs option:selected").length) {
@@ -134,9 +134,9 @@ $(document).ready(function(){
         }
 
         // update the elements
-        $('#deleteRootDir').attr('disabled', do_disable);
-        $('#defaultRootDir').attr('disabled', do_disable);
-        $('#editRootDir').attr('disabled', do_disable);
+        $('#deleteRootDir').prop('disabled', do_disable);
+        $('#defaultRootDir').prop('disabled', do_disable);
+        $('#editRootDir').prop('disabled', do_disable);
 
         var log_str = '';
         var dir_text = '';